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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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<body>
    <script>
        //第一种
        // console.log(Array.isArray([1,2,4]))
        // //第二种
        // console.log([].constructor === Array)
        // 第三种
        //  function isArray(date){
        //     return Object.prototype.toString.call(date) ==='[Object Array]'
        //  }
        //  console.log(isArray([1,2,3]))
        //  console.log(isArray({a:1}))

         function isArray(data) {
        return Object.prototype.toString.call(data) === '[object Array]'
      }

      console.log(isArray([1, 2, 3]))
      console.log(isArray({ a: 1 }))
    </script>
</body>
</html>